Numerical Study on Axial Spiral Turbine for Down-hole Generator | |
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( Volume 2 Issue 5,May 2016 ) OPEN ACCESS | |
Author(s): | |
Xiaodong Zhang, Huiping Lu, Xuehu Liu, Yan Gong, Wenwu Yang | |
Abstract: | |
In order to study the hydraulic performance of spiral turbine for down-hole generator, three dimensional flow field simulation model of turbine was established. According to the actual working condition of down-hole Generator, theoretical calculation method of axial spiral turbine was given based on design theory of spiral turbine with constant pitch and uniform thickness. Furthermore,the performance of spiral blade was studied from the three main aspects of the stator and rotor’s spiral angle , rotation angle and blade number. By comparing simulation results with theoretical values, it verified the validity of the simulation model and the correctness of the theoretical calculation. Meanwhile, the influence of blade number, spiral angle and rotation angle on output torque, pressure drop and efficiency of the turbine were investigated. The results show that the influence degrees on torque value among the rotor’s and stator’s blade number, spiral angle, rotation angle are different. The blade number of stator and rotor is best for prime number, and it is relatively appropriate that the number of rotor blades should be more than the stator’s. For the blade number between stator and rotor is different, the corresponding values of optimal rotation angle and spiral angle are different. Spiral angle and rotation angle should not be too big or small. And the rotor’s spiral angle should be less than stator’s. Compared with the rotation angle, spiral angle plays a greater role in turbine hydraulic performance. In practice, the appropriate rotation angle should be selected to be matched with the corresponding spiral angle according to the design requirements. |
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